Hello,

I am trying to use the elmer fem for thermal analysis of electrical machine . I have some problems in the boundary definition the Heat transfer coefficient means the natural our force convection coefficient plus radiation?if it is not correct how can I calculate this element ?

## Heat transfer coefficient

### Re: Heat transfer coefficient

Hi,

the heat transfer coefficient can include conduction and convection. The radiation can be taken in to account separately.

I would suggest that you read the corresponding chapter in the Elmer Models manual.

Matthias

the heat transfer coefficient can include conduction and convection. The radiation can be taken in to account separately.

I would suggest that you read the corresponding chapter in the Elmer Models manual.

Matthias

### Re: Heat transfer coefficient

For calculation of convection coefficient --I usually use the dimensionless numbers and calculated base some empirical correlations .

here I have to make this calculation and then put the number in sif ?

Do you have any example about calculation of this factor for Elmer ?

here I have to make this calculation and then put the number in sif ?

Do you have any example about calculation of this factor for Elmer ?

### Re: Heat transfer coefficient

Yes.payam wrote:For calculation of convection coefficient --i usually use the dimension less number and calculated base some empirical correlations .

here oi have to make this calculation and then put the number in sif ?

No, it depends on your geometry and how accurately you want to determine this coefficient.payam wrote:Do you have any example about calculation of this factor for Elmer ?

Matthias